656999444 has 6 divisors (see below), whose sum is σ = 1149749034. Its totient is φ = 328499720.

The previous prime is 656999443. The next prime is 656999479. The reversal of 656999444 is 444999656.

It can be written as a sum of positive squares in only one way, i.e., 353891344 + 303108100 = 18812^2 + 17410^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 656999444.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656999443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82124927 + ... + 82124934.

It is an arithmetic number, because the mean of its divisors is an integer number (191624839).

Almost surely, 2^656999444 is an apocalyptic number.

It is an amenable number.

656999444 is a deficient number, since it is larger than the sum of its proper divisors (492749590).

656999444 is a wasteful number, since it uses less digits than its factorization.

656999444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164249865 (or 164249863 counting only the distinct ones).

The product of its digits is 8398080, while the sum is 56.

The square root of 656999444 is about 25632.0003901373. Note that the first 3 decimals coincide. The cubic root of 656999444 is about 869.3373401122.

The spelling of 656999444 in words is "six hundred fifty-six million, nine hundred ninety-nine thousand, four hundred forty-four".